The change from red blood to dark blood during ovulation is a physiological process that every woman must go through. It marks the improvement of female fertility and the strengthening of reproductive capacity. During ovulation, a woman's vaginal discharge will increase and change color, ranging from red to black. These changes not only cause discomfort to women, but they also have some scientific explanation.

During ovulation, the color of the blood changes from red to dark brown or black. This is because when the egg is waiting to be fertilized in the fallopian tube, the woman's hemoglobin is broken down into oxygen and carbon dioxide, and at the same time releases some substances that change the color of the blood.

These changes play an important role in women's physiology and fertility. First, dark brown or black blood can help women release eggs better and improve fertility. Secondly, blood color changes can also help women better identify whether they are in a dangerous period and thus take better measures to avoid pregnancy.

Although changes in blood color cause discomfort to women, scientifically they play an important role in women's physiology and fertility. Therefore, women should understand their body changes as much as possible and take measures to ensure their fertility during the dangerous period.